Dilepton production in the SMEFT at O (1 / Λ4)

Radja Boughezal, Emanuele Mereghetti, Frank Petriello

Research output: Contribution to journalArticlepeer-review

Abstract

We study the inclusion of O(1/Λ4) effects in the Standard Model effective field theory in fits to the current Drell-Yan data at the LHC. Our analysis includes the full set of dimension-6 and dimension-8 operators contributing to the dilepton process, and is performed to next-to-leading-order in the QCD coupling constant at both O(1/Λ2) and O(1/Λ4). We find that the inclusion of dimension-6 squared terms and certain dimension-8 operators has significant effects on fits to the current data. Neglecting them leads to bounds on dimension-6 operators off by large factors. We find that dimension-8 four-fermion operators can already be probed to the several-TeV level by LHC results, and that their inclusion significantly changes the limits found for dimension-6 operators. We discuss which dimension-8 operators should be included in fits to the LHC data. Only a manageable subset of two-derivative dimension-8 four-fermion operators need to be included at this stage given current LHC uncertainties.

Original languageEnglish (US)
Article number095022
JournalPhysical Review D
Volume104
Issue number9
DOIs
StatePublished - Nov 1 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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